BS EN 1225:1996 Plastics piping systems - Glass - reinforced thermosetting plastics ( GRP ) pipes - Determination of the creep factor under wet conditions and calculation of the long - term specific ring stiffness
1970BS EN 1225:1996 Plastics piping systems - Glass - reinforced thermosetting plastics ( GRP ) pipes - Determination of the creep factor under wet conditions and calculation of the long - term specific ring stiffness